Evaluate expression given as a string

Question

I\'m curious to know if R can use its eval() function to perform calculations provided by e.g. a string.

This is a common case:

eval(\"5         


        

Answer 1

Alternatively, you can use evals from my pander package to capture output and all warnings, errors and other messages along with the raw results:

> pander::evals("5+5")
[[1]]
$src
[1] "5 + 5"

$result
[1] 10

$output
[1] "[1] 10"

$type
[1] "numeric"

$msg
$msg$messages
NULL

$msg$warnings
NULL

$msg$errors
NULL


$stdout
NULL

attr(,"class")
[1] "evals"